I choose simple, low-cost, reader screen 6 inch for middle-aged people. The main requirement is that in addition to reading major formats (fb2, etc.) there is a need to read scanned books in the djvu format. It is clear that you can convert to pdf, but essentially it does not change.
On the e-readers that I enjoyed (the b&n nook, amazon kindle), it is impossible to comfortably read scanned djvu\\pdf or the font is too small, or flipping uncomfortable with the scale of the problem.
In addition, it is very desirable Russian interface, because of the old school, and English friendly so far as.
Most likely will fit any "Russian" or "Ukrainian" reader, because they are focused on such formats.
Would really appreciate advice from actual users of such newsreaders
OBNW. As I understand it, theoretically, software can be properly massturbate pdf, relative to the center of the text, and show half a page. If it's somewhere implemented then it would be great to know where.